Re: about __get,__set Overloading, read-only properties

ked schreef: > My idea is just your answer...happy..ing ^_^ > > You are so warmhearted. Thanks a lot! : ) I don't get accused of that very often. are you being sarcastic or did my suggestion help? (sorry I didn't quite understand your reply) > > I will never post a question to a existing thread . good. that's one down 1,000,983 to go :-) > >> -----Original Message----- >> From: Jochem Maas [mailto:jochem@iamjochem.com] >> Sent: Friday, December 21, 2007 9:11 AM >> To: ked >> Cc: php-general@lists.php.net >> Subject: Re: [PHP] about __get,__set Overloading, read-only properties >> >> pleae don't reply to an existing thread when posting a new question. >> >> ked schreef: >>> Hi. all , >>> >>> I got a article from php 5.0 manual's comments. It's useful, offer >>> readonly properties for classes. >>> >>> (look at the end of this message for the article ) >>> >>> find out function __construct(), I want to modify >> $this->id in it , >>> then I got a "readonly" Exception (defined in "__set" function). >>> >>> Distinctly, a read-only property could not be change via >>> "$obj->attribute = '' " , but is could be change via >> $this->id='', >>> inside of class , isn't it ? >>> >>> How to modify __set function ? >> don't - let __set() be the policeman it's supposed to be. >> either create a private function to initialize values or set >> the values directly in the array >> >> private function init($k, $v) >> { >> if (isset($this->p_arrPublicProperties[$k])) >> $this->p_arrPublicProperties[$k]['value'] = $v; } >> >>> thanks for any advises. >>> >>> regards! >>> ked >>> >>> >>> the article is here: >>> >> ---------------------------------------------------------------------- >>> ------ >>> ------------------------ >>> Eric Lafkoff (22-Feb-2006 02:56) >>> >>> If you're wondering how to create read-only properties for >> your class, >>> the >>> __get() and __set() functions are what you're looking for. You just >>> have to create the framework and code to implement this >> functionality. >>> Here's a quick example I've written. This code doesn't take >> advantage >>> of the "type" attribute in the properties array, but is >> there for ideas. >>> <?php >>> class Test >>> { >>> private $p_arrPublicProperties = array( >>> "id" => array("value" => 4,"type" => >>> "int","readonly" => true), >>> "datetime" => array("value" => "Tue 02/21/2006 >> 20:49:23","type" => >>> "string", "readonly" => true), >>> "data" => array("value" => "foo", "type" >>> => "string", >> "readonly" => >>> false) >>> ); >>> >>> //ked add!!!!!!! >>> public function __construct() >>> { >>> $this->id = 100; //----------------------------will get >> exception !! >>> } >>> >>> private function __get($strProperty) { //Get a property: >>> if (isset($this->p_arrPublicProperties[$strProperty])) { return >>> $this->p_arrPublicProperties[$strProperty]["value"]; >>> } else { >>> throw new Exception("Property not defined"); return false; } } >>> >>> private function __set($strProperty, $varValue) { //Set a >> property to >>> a value: >>> if (isset($this->p_arrPublicProperties[$strProperty])) { //Check if >>> property is read-only: >>> if ($this->p_arrPublicProperties[$strProperty]["readonly"]) { throw >>> new Exception("Property is read-only"); >>> ///////////////////////////////////---------------note here return >>> false; } else { >> $this->p_arrPublicProperties[$strProperty]["value"] = >>> $varValue; return true; } } else { throw new >> Exception("Property not >>> defined"); return false; } } >>> >>> private function __isset($strProperty) { >>> //Determine if property is set: >>> return isset($this->p_arrPublicProperties[$strProperty]); >>> } >>> >>> private function __unset($strProperty) { >>> //Unset (remove) a property: >>> unset($this->p_arrPublicProperties[$strProperty]); >>> } >>> >>> } >>> $objTest = new Test(); >>> print $objTest->data . "\n"; >>> $objTest->data = "bar"; //Works. >>> print $objTest->data; >>> $objTest->id = 5; //Error: Property is read-only. >>> ?> >>> >> -- >> PHP General Mailing List (http://www.php.net/) To >> unsubscribe, visit: http://www.php.net/unsub.php >> >> >> >